[0001] The present invention relates to an overflow device for water drain assemblies, in
particular for drainage systems for roofs of buildings, and to a water drain assembly,
in particular for drainage systems for roofs of buildings, provided with said overflow
device.
[0002] In general, a drainage system for roofs of building for draining rain water is made
up of collection drain assemblies and a network of pipes.
[0003] Normally, the drainage system is sized according to the rainfall expected in the
locality where it is installed. It is, however, expedient to provide alongside the
main system an emergency system, having the function of preventing overloading of
the roof of the building in the event of a rainfall higher than what is expected.
[0004] An emergency system can be obtained in various ways, such as, for example:
- by making holes in the parapets that delimit the roof of the building in such a way
that an increase in the level of water accumulated on the roof will be discharged
outside the building through said holes;
- by providing a secondary rainwater-drainage system, either of a conventional type
(without siphon) or with siphon effect, which intervenes when, for example following
upon rainfall that is more intense than what is expected, the level of water on the
roof exceeds the design level for the main system.
[0005] The secondary system can be made up of drain assemblies of the same type as those
of the main system, or else of some other type. For example, traditional drain assemblies
(exploiting gravity) or siphon drain assemblies (exploiting the siphon action) may
be used.
[0006] An emergency system with siphon drain assemblies can be obtained in various ways:
- by installing the siphon drain assemblies, of the same type as the drain assemblies
used for the main system, at a higher level than the latter (for example, 55 mm above
the roof), thus creating purposely designed raised structures made of concrete, wood,
sheet metal, or other material forming part of the roof;
- by using drain assemblies sized purposely and exclusively for providing the emergency
systems (which are different from the ones used for the main system that operates
in normal conditions);
- by using inserts, components, accessories that basically modify the siphon drain assemblies
designed for the main system so that they can work with a higher water level and hence
are rendered suitable for use in the emergency system.
[0007] Clearly, the latter solution avoids the need for design, production, and logistic
management of drain assemblies of a different type for the main system and for the
secondary system and does not require provision of auxiliary structures (raised structures)
on the roof of the building.
[0008] Known solutions of this type do not seem, however, fully satisfactory, above all
in terms of simplicity of construction and assembly of the accessory, as well as of
overall effectiveness of the drain assembly. The addition of an accessory on a drain
assembly appropriately designed for providing certain levels of performance can in
fact alter the efficiency of the drain assembly itself.
[0009] In addition, known accessories enable only raising of the drain assembly by a pre-set
height, determined by the size of the accessory, but in general do not allow adjustment
in height of the drain assembly. In order to obtain different heights, it is, instead,
necessary to use accessories of different dimensions, or else envisage cutting a raised-structure
accessory to the desired height.
[0010] An aim of the present invention is to provide a water drain assembly, in particular
for drainage systems for roofs of buildings, that will overcome the drawbacks highlighted
above.
[0011] In particular, an aim of the invention is to provide an overflow device that can
be applied to water drain assemblies in a simple and effective way, the device being
simple and inexpensive to produce, easy to install, and fully effective not only for
raising the level of water entering the drain assembly on which the overflow device
is installed, but that will also enable adjustment of said level.
[0012] The present invention hence regards an overflow device for water drain assemblies,
in particular for drainage systems for roofs of buildings as defined in basic terms
in the annexed Claim 1 and, as regards its additional features, in the dependent claims.
[0013] The invention moreover regards a water drain assembly, in particular for drainage
systems for roofs of buildings, as defined in the annexed Claim 13, said water drain
assembly being provided with said overflow device.
[0014] The overflow device according to the invention is simple and inexpensive to produce
and install, has contained dimensions, and is fully effective. In particular, the
overflow device according to the invention can be applied to water drain assemblies
in a simple and effective way, without altering the levels of performance of the drain
assembly. The overflow device then has a high versatility in so far as it enables
raising of the level of water entering the drain assembly and also adjustment of said
level.
[0015] Further characteristics and advantages of the present invention emerge clearly from
the ensuing description of a non-limiting example of embodiment thereof, with reference
to the figures of the annexed plates of drawings, wherein:
- Figure 1 is a partially exploded schematic view in longitudinal section of a water
drain assembly, in particular for siphon-effect drainage systems for roofs of buildings,
provided with an overflow device according to the invention;
- Figure 2 is a perspective view from beneath of a component of the overflow device
shown in Figure 1; and
- Figure 3 is a perspective view from above of a further component of the device of
Figure 1.
[0016] In Figure 1 designated by 1 is a water drain assembly, in particular forming part
of a drainage system for roofs of buildings. The system is not illustrated as a whole
and comprises, as is known, a plurality of drain assemblies installed generally on
the roof of the building, and pipes and collectors of various sizes and shapes, which
connect each drain assembly to a main pipe for discharge outside the building.
[0017] The drain assembly 1 extends basically along an axis A (which, in use, is substantially
vertical) and mainly comprises a base body 2, having an opening 3 for inlet of the
water, which communicates with a duct 4 formed inside the body 2, and a lid 5 set
above the body 2 and provided with a top grid 6.
[0018] In the example illustrated, but not necessarily, the drain assembly 1 is a siphon-effect
drain assembly.
[0019] The body 2 is a basically tubular body shaped as a whole like a funnel and comprises
a bottom tubular portion 8, which is, for example, substantially cylindrical, and
is provided inside with the duct 4, and a top inlet flange 9, which is radially external
and substantially annular, is provided at the centre with the opening 3, and has an
annular top surface 10, optionally inclined and/or flared radially inwards (or having
an inclined or flared portion) with respect to the axis A, which conveys the water
to the opening 3 and then into the duct 4.
[0020] Optionally, as shown in Figure 1, but not necessarily, the flange 9 is formed by
two concentric pieces inserted inside one another and joined together, for example
via screws.
[0021] The lid 5 comprises the grid 6 and, preferably, an anti-vortex disk 12, which is
set underneath the grid 6 and is shaped in such a way as to prevent formation of vortices
in the water entering the drain assembly 1 and introduction of air in the drain assembly
1. In particular, the disk 12 has a plurality of blades 13, which extend from a bottom
face of the disk and convey the water into the body 2 preventing formation of vortices.
The blades 13 are arranged radially about the axis A and are angularly spaced apart
from one another.
[0022] The lid 5 is joined to the body 2 via fixing members 15, for example of a threaded
type. In the non-limiting example illustrated, the flange 9 carries screws 16, which
extend vertically through respective holes 17 formed in the lid 5 and are blocked
by nuts.
[0023] The grid 6 is substantially cage-shaped and is set on top of the disk 12 for covering
and enclosing the disk 12. The grid 6 is joined to the disk 12 with fixing members
18, for example with a central screw 19 associated to an anti-rotation spider (which
couples the grid 6 and the disk 12 so that they are angularly fixed with respect to
one another).
[0024] According to the invention, the drain assembly 1 is provided with an overflow device
25 comprising a removable overflow accessory component 30, which has the purpose of
rendering the drain assembly 1 suitable for use both in a main drainage system (operating
in normal conditions, with a level of rainfall within the design limits envisaged)
and in a secondary emergency system (operating in the case of rainfall that is higher
than what is envisaged for normal operation of the main system). More in general,
the overflow device 25 and the component 30 have the purpose of varying the height
of the drain assembly 1, and precisely raising the level of entry of the water into
the drain assembly 1.
[0025] The component 30 is removably inserted between the flange 9 of the body 2 and the
lid 5.
[0026] The component 30 comprises a lower element 31 and an upper element 32, which are
telescopically coupled together along the axis A, and a height-adjustment device 33
for varying the axial height (measured along the axis A) of the component 30, via
which the position of the elements 31, 32 with respect to one another along the axis
A is varied, and consequently also the axial height of the component 30 (measured
along the axis A).
[0027] The elements 31, 32 are mobile with respect to one another. More precisely, the elements
31, 32 are able to turn with respect to the axis A and slide axially along the axis
A with respect to one another.
[0028] With reference also to Figures 2-3, the elements 31, 32 are substantially annular
elements that extend about the axis A and are concentric. The elements 31, 32 have
respective annular plates 35, 36 facing one another and respective radially external
side walls 37, 38, which extend towards one another.
[0029] In greater detail, the lower element 31 has a substantially flat annular plate 35,
and a radially external side wall 37, which is substantially cylindrical and extends
from a radially external peripheral edge of the plate 35. The element 31 comprises
a substantially cylindrical central sleeve 41, arranged through the plate 35 in a
position corresponding to a radially internal peripheral edge of the plate 35. The
sleeve 41 is sized in such a way that it can be inserted through the opening 3 and
penetrate into the duct 4.
[0030] The plate 35 has a substantially plane bottom surface 42, which rests in use on the
surface 10 of the flange 9. The surface 42 is provided with a circumferential groove
43 that houses an axial seal ring 44 co-operating with the surface 10.
[0031] The annular plate 36 of the upper element 32 is optionally shaped in such a way as
to reproduce the surface 10 of the flange 9. In any case, the plate 36 has a top annular
surface 45, optionally inclined radially inwards with respect to the axis A, which
replaces the surface 10 of the flange 9 in the function of conveying the water into
the drain assembly 1.
[0032] The side wall 38 of the plate 36 of the upper element 32 is substantially cylindrical
and is set radially external around the wall 37 of the lower element 31. The element
32 comprises a substantially cylindrical central sleeve 46, which extends from a radially
internal peripheral edge of the plate 36 downwards and is inserted into the sleeve
41 of the element 31. The sleeve 46 is provided with a radial seal ring 47, housed,
for example, in an annular groove 48 formed on an external lateral surface of the
sleeve 46 and co-operating with an internal lateral surface of the sleeve 41.
[0033] The elements 31, 32 are coupled together and define an internal annular chamber 49,
delimited by the plates 35, 36 and by the walls 37, 38 and set around a central through
duct 50, which extends along the axis A and is formed by the sleeves 41, 46.
[0034] The height-adjustment device 33 comprises supporting members 51, 52 carried by the
elements 31, 32 and co-operating for supporting the two elements 31, 32 axially in
a position selected from among a plurality of pre-set positions, corresponding to
respective different axial heights of the component 30.
[0035] In particular, the supporting members 51, 52 are defined, respectively, by at least
one series of steps 53 formed on one of the elements 31, 32 and having different axial
heights (measured parallel to the axis A), and by at least one abutment step 54, formed
on the other one of the elements 31, 32 and co-operating axially in contrast with
a selected one of the steps 53.
[0036] In the non-limiting example illustrated, the device 33 comprises two sets of steps
53, 54, which are formed on respective elements 31, 32 and extend towards one another
from the plates 35, 36.
[0037] Each of the elements 31, 32 has steps 53, 54 having different heights (measured along
the axis A starting from the plates 35, 36) and arranged circumferentially alongside
one another along the walls 37, 38 within the chamber 49 delimited by the two elements
31, 32 coupled together.
[0038] Each element 31, 32 has at least one series (and preferably at least two series)
of two or more steps 53, 54 (three steps, in the example illustrated) having increasing
heights.
[0039] In the example illustrated, each element 31, 32 has three equal series of steps 53,
54 (each formed, for example, by three steps); the series are formed by equal steps
53, 54 and are angularly staggered along the respective walls 37, 38.
[0040] The steps 53 of each series of the lower element 31 have heights that increase in
a pre-set direction (for example, the counterclockwise direction), whereas the steps
54 of each series of the upper element 32 have heights that increase in an opposite
direction (for example, the clockwise direction).
[0041] The steps 53, 54 of the two elements 31, 32 are shaped in such a way that the steps
53 of the element 31 engage respective steps 54 of the other element 32 in a plurality
of pre-set positions, which correspond to as many positions of the elements 31, 32
with respect to one another and precisely to different axial heights (along the axis
A) of the component 30.
[0042] The steps 53, 54 of the two elements 31, 32 can be coupled in different ways, corresponding
to respective heights of the component 30. In particular, the steps 53, 54 are shaped
so as to support axially the elements 31, 32 with respect to one another in a plurality
of pre-set positions, in which the surfaces 42, 45 are at respective pre-set distances
from one another and hence the component 30 has different heights.
[0043] In greater detail, the steps 54 of the upper element 32 rest on the steps 53 of the
lower element 31. If the highest steps 54 of the upper element 32 engage (rest on)
the lowest steps 53 of the lower element 31, then the two elements 31, 32 are in a
first position with respect to one another where the distance between the surfaces
42, 45, and hence also the overall height of the component 30, are minimum.
[0044] By displacing the elements 31, 32 with respect to one another (in particular, via
rotation about the axis A and translation along the axis A) and bringing the steps
54 of the upper element 32 to engage other steps 53 of the lower element 31, the axial
distance between the elements 31, 32 is modified, and hence also the height of the
component 30.
[0045] When the highest step 54 of the upper element 32 is coupled to the intermediate step
53 of the lower element 31, the component 30 has an intermediate height. When the
highest step 54 of the upper element 32 engages the highest step 53 of the lower element
31, the component 30 has the maximum height.
[0046] Clearly, the elements 31, 32 can be provided with a different number of steps 53,
54 with respect to what has been described herein purely by way of example.
[0047] Once the elements 31, 32 are coupled in the position corresponding to the desired
height of the component 30, the elements 31, 32 are fixed together and, preferably,
to the base body 2 via fixing members 55, for example threaded fixing members 55.
[0048] For example, the fixing members 55 comprise screws 56 (just one of which is shown
in Figure 1), each of which is set through a pair of aligned holes 57, 58 (shown in
Figures 2, 3) formed in the two elements 31, 32 respectively.
[0049] Clearly, the elements 31, 32 have holes 57, 58 arranged so as to define pairs of
aligned holes in each of the pre-defined positions of the elements 31, 32.
[0050] Advantageously, the fixing members 55 not only connect the elements 31, 32 together,
but also engage the flange 9 of the body 2 so as to fix the component 30 to the body
2.
[0051] According to a preferred embodiment, the fixing members 55 comprise prolongation
accessories 59 that are fitted on the screws 16 already provided for fixing the body
2 to the lid 5.
[0052] Finally, it is understood that modifications and variations may be made to the overflow
device and to the drain assembly described and illustrated herein, without thereby
departing from the scope of the invention, as defined in the annexed claims.
1. An overflow device (25) for water drain assemblies, in particular for drainage systems
for roofs of buildings, comprising a removable overflow accessory component (30),
extending substantially along an axis (A) and mountable on a water drain assembly
(1) for varying the height of the drain assembly (1) and raising the level of the
water entering the drain assembly (1); the device being characterized in that the component (30) comprises a lower element (31) and an upper element (32), telescopically
coupled together along the axis (A), and a height-adjustment device (33) for varying
the position of the elements (31, 32) with respect to one another along the axis (A)
and consequently the axial height of the component (30).
2. The device according to Claim 1, wherein the height-adjustment device (33) comprises
supporting members (51, 52) carried by the elements (31, 32) and co-operating for
supporting the two elements (31, 32) axially in a position selected from among a plurality
of pre-set positions, corresponding to respective different axial heights of the component
(30).
3. The device according to Claim 2, wherein the supporting members (51, 52) are defined,
respectively, by at least one series of steps (53) formed on one of the elements (31,
32) and having different axial heights, and by at least one abutment step (54), formed
on the other of the elements (31, 32) and co-operating axially in contrast with a
selected one of the steps (53).
4. The device according to Claim 3, wherein the height-adjustment device (33) comprises
two sets of steps (53, 54), which are formed on respective elements (31, 32) and extend
towards one another; each of the elements (31, 32) having steps (53, 54) that have
different heights and are arranged circumferentially alongside one another along respective
side walls (37, 38) of the elements (31, 32) within a chamber (49) delimited by the
two elements (31, 32) coupled together.
5. The device according to Claim 3 or Claim 4, wherein each element (31, 32) has at least
one series and preferably at least two series of two or more steps (53, 54) having
increasing heights.
6. The device according to Claim 5, wherein the steps (53, 54) of the two elements (31,
32) have, in each series, heights that increase in opposite directions.
7. The device according to any one of Claims 3 to 6, wherein each element (31, 32) has
three equal series of steps (53, 54), the series being formed by equal steps (53,
54) and being angularly staggered.
8. The device according to any one of Claims 2 to 7, comprising fixing members (55) for
fixing the elements (31, 32) with respect to one another in the position selected
from among the plurality of pre-set positions.
9. The device according to Claim 8, wherein the fixing members (55) comprise screws (56),
each of which is set through a pair of aligned holes (57, 58) formed in the two elements
(31, 32), respectively; the elements (31, 32) having holes (57, 58) arranged so as
to define pairs of holes aligned in each of the pre-set positions of the elements
(31, 32).
10. The device according to any one of the preceding claims, wherein the elements (31,
32) are substantially annular concentric elements and have respective central sleeves
(41, 46) inserted telescopically inside one another and defining a central through
duct (50).
11. The device according to Claim 10, wherein a radial seal ring (47) is radially set
between the sleeves (41, 46).
12. The device according to any one of the preceding claims, wherein the lower element
(31) has a bottom surface (42) provided with a circumferential groove (43), which
houses an axial seal ring (44).
13. A water drain assembly (1), in particular for drainage systems for roofs of buildings,
characterized by comprising an overflow device (25) according to any one of the preceding claims.
14. The drain assembly according to Claim 13, comprising a base body (2), having a substantially
annular top inlet flange (9) provided centrally with an opening (3) for inlet of the
water, which communicates with a duct (4) formed inside the body (2), and a lid (5)
set on the body (2) and provided with a top grid (6); and wherein the component (30)
is removably inserted between the flange (9) of the body (2) and the lid (5).
15. The drain assembly according to Claim 14, wherein fixing members (55) connect the
elements (31, 32) together and engage also the flange (9) of the body (2) so as to
fix the component (30) to the body (2).